The low-lying quadrupole states in Sn isotopes have been investigated in the framework of fully self-consistent Hartree-Fock+BCS plus QRPA. We pay attention to how the density-dependence of pairing interaction affects the properties of low-lying quadrupole state. The SLy5 Skyrme interaction with surface, mixed, and volume pairings are employed in the calculations, respectively. We find that the excitation energies and the corresponding reduced electric transition probabilities of first 2+ state are different given by three pairing interactions. The properties of quasiparticle state, two-quasiparticle excitation energy, the reduced transition amplitude, and the transition densities in 112Sn are analyzed in details. Two different mechanisms, static and dynamical effect, of pairing correlation are also discussed. The results show that the surface, mixed, and volume pairing indeed affect the properties of first 2+ state in Sn isotopes.
This analysis presents the possibility for the search for Dark Matter (DM) particles using events with a Z
We calculate the photon sphere
Proton capture reactions on Mg isotopes play important roles in the Mg-Al cycle in stellar H-burning. In particular, the resonance strengths and branching ratios of low-energy resonances in 25Mg(
In our previous studies [Phys. Rev. C 97, 044619 (2018); Phys. Rev. C 103, 044610 (2021)], a universal odd-even staggering (OES) has been observed in extensive cross sections of isotopes not far from stability measured in different fragmentation and spallation reactions, and four OES relations have been proposed on the basis of this OES universality. However, it is still unclear whether this OES universality and OES relations are applicable for many isotopes near the drip-lines. In this work, the OES in recent experimental cross sections of very neutron-rich nuclei approaching the drip-line (from
The dynamics of high-energy proton-induced spallation reactions on target nuclides of 56Fe, 58Ni, 107Ag, 112Cd, 184W, 181Ta, 197Au and 208Pb, are investigated with the quantum molecular dynamics transport model motivated by the China initiative Accelerator Driven System (CiADS) in Huizhou and China Spallation Neutron Source (CSNS) in Dongguan. The production mechanism of light nuclides and fission fragments is thoroughly analyzed and the results obtained thereby are compared with available experimental data. The statistical code GEMINI is employed in conjunction to the transport model for describing the decay of primary fragments. For the treatment of cluster emission during the preequilibrium stage, a surface coalescence model is implemented into the model. It is found that the available data in terms of total fragment yields are well reproduced in the combined approach for spallation reactions both on the heavy and light targets. The energetic light nuclides (deuteron, triton, helium isotopes etc) mainly created during the preequilibrium stage are treated within the framework of surface coalescence whereas their evaporation is described in the conventional manner by the GEMINI code. With the combined approach, a fairly well overall description of light clusters and neutron emission is obtained and some discrepancies against the experimental data are discussed. Possible production of radioactive isotopes with the spallation reactions is also analyzed, i.e., the 6,8He energy spectra.
A multi-nucleon transfer and cluster decay experiment,
This paper presents the impact of lepton transverse momentum
The first Water Cherenkov detector of the LHAASO experiment (WCDA-1) has been operating since April, 2019. The first 10 months of data have been analyzed to test its performance by observing the Crab Nebula as a standard candle. The WCDA-1 achieves the sensitivity of 65 mCU per year with a statistical threshold of 5
A perturbative method to compute the total travel time of both null and lightlike rays in arbitrary static spherically symmetric spacetimes in the weak field limit is proposed. The resultant total time takes a quasi-series form of the impact parameter. The coefficient of this series at a certain order n is shown to be determined by the asymptotic expansion of the metric functions to the order
In this paper, we utilize a potentially versatile Bayesian parameter approach to compute the value of the pion charge radius and quantify its uncertainty from several experimental
We present a preliminary study of charge exchange heavy ion induced reactions based on the Constrained Molecular Dynamics (CoMD) model. The purpose is to test the capability of the model to predict the occurrence of Single Charge Exchange (SCE) and Double Charge Exchange (DCE) exit channels for three different entrance channels at the same laboratory incident energy. The nuclear reaction dynamics and the nuclear interaction within the CoMD approach are the only ingredients which have given, at this stage, promising results for SCE and DCE cross section calculations. The obtained results suggest the upgrade and the future employment of the model for studies relating the production of exotic nuclei through charge exchange reactions or DCE reactions and their connection with neutrinoless double beta decay.
Excited states in the odd-A nucleus 71Ga have been studied via the 70Zn(7Li,
The isospin effects of the projectile fragmentation at intermediate energy are investigated using an isospin-dependent Boltzmann-Langevin model. The collisions of mass-symmetric reactions 58Fe, 58Ni + 58Fe, 58Ni at intermediate energies from 30 to 100 MeV/A are studied with different symmetry energies. Yield ratios of isotopic, isobaric and isotonic pairs of fragments from the intermediate-mass region using three symmetry energies are extracted as a function of the N/Z of the composite systems in the entrance channel and the incident energies. It is found that the yield ratios are sensitive to symmetry energies, especially for the neutron-rich systems, and the calculations using soft symmetry energy are closer to the experimental data. The isospin effect is stronger in the soft symmetry energy due to the competition of repulsive Coulomb force and symmetry energy attractive force to the proton. For the first time, the splits are presented, revealing a transition from isospin equilibrium at lower energies to translucency at intermediate energies. The results show a degree of transparency in that the intermediate mass fragments undergo a transition from dependence on the composite systems in the entrance channel to reliance on the projectile and target nuclei.
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